I always taste my sample when I'm taking a reading, why not? Just remember as has been said, in general it is a poor indication of how the finished beer will taste.
I have always had the best results with corn sugar solution in my bottling bucket. I use a calculator to match the style. I tried the fizz drops, and wasn't necessarily unhappy with the results, but I find dropping pills or tabs or whatever into so many bottles just increases the time and aggravation of bottling.